Bug#932127: Further information regarding: grub-common: Fails loading snapshot after snapper rollback

[Thomas Schneider]

After applying the workaround the system is booting the expected 
snapshot 3; validation confirms that program "reportbug" is not installed.
Executing the following commands the Grub entries will change and load 
the new default snapshot 6 only as documented in attached screenshot.

Linux vm103-debian9 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1+deb9u3 
(2019-06-16) x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Mon Jul 15 17:06:49 2019 from 192.168.100.11

thomas at vm103-debian9:~$ apt-cache policy reportbug
reportbug:
   Installiert:           (keine)
   Installationskandidat: 7.1.7+deb9u2
   Versionstabelle:
      7.5.2 100
         100 http://deb.debian.org/debian testing/main amd64 Packages
          -1 http://deb.debian.org/debian unstable/main amd64 Packages
      7.1.7+deb9u2 500
         500 http://deb.debian.org/debian stretch/main amd64 Packages

thomas at vm103-debian9:~$ sudo grub-install /dev/sda
x86_64-efi wird für Ihre Plattform installiert.
installation beendet. Keine Fehler aufgetreten.

thomas at vm103-debian9:~$ sudo update-grub
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.9.0-9-amd64
Found initrd image: /boot/initrd.img-4.9.0-9-amd64
Adding boot menu entry for EFI firmware configuration
done

thomas at vm103-debian9:~$ sudo reboot
Connection to 192.168.100.103 closed by remote host.

This means that only snapshot 6 will be booted independant of the 
defined default snapshot.
Hence any further snapper rollback will be ignored.
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